Propenultimate

“Halnaker is the family name?” “Yes. Spelt H-a-l-n-a-k-e-r and pronounced Hannaker, with the accent on the Hann—the pro-penultimate, as we were taught to call it at school. The propenultimate, if you please. What unmitigated nonsense! Why not the last-but-two?”

In Latin polysyllabic words are stressed on the penultimate syllable if this is long; otherwise on the propenultimate syllable, provided that there is one.